PDF malware analysis — malicious · a73e0e58963c963d

MALICIOUS

PDF

44.2 KB

MD5: dbaf4cf647cefdcab8a65cdcbdc62941 SHA-1: 1284eb9d1ef3d000d72a239e93abfc4b5b328c80 SHA-256: a73e0e58963c963d616ee2df994983e3eb1eebc91f2187ec2b15f95db4bb3c15

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability related to 'collab.collectEmailInfo'. The critical heuristic indicates that the PDF launcher uses specific functions to decode and evaluate a hex-encoded JavaScript stager. This stager is responsible for downloading and executing a secondary payload, as evidenced by the large deobfuscated JavaScript files extracted. The presence of U3D content also suggests an exploit attempt.

Heuristics 7

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `af6f376e462eec7dfbd022a27879d23f8ef9e27c8626fb62b1c587ba12a722df`	pdf-javascript-stream	PDF /JS object 9 at offset 0x4258	436 bytes
`annotation_subject_callee_hex_stage_000.js` `1d2e207eccf13482b8fa857b5c368d6720151d10a5323a43063bb93bc8b02093`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1AF2	5433 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `416e23dd501fe590731f0a899fbd26d5bb18494571561b5a7aa60bfeee4ef291`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B46	12145 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `148ece4c28d76d5f48442cbe8f4791698dfbefb04a41372b5e56ad1395fccfcc`	deobfuscated-js	PDF JavaScript deobfuscation pass	228408 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off00004492.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4492	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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